Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh thai » nhanh thai, hinh thai, hanh tai
van hanh » van thanh, ban hanh, van anh
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, dua tren
thu san » thuy san, thu ban, phu san
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
tu sac » tu sach, tu cac, tu san
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
o lai » o lao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (thu san)) ky nang o lai. hieu ve cac duc van hanh thai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu san)) ky nang o lai. hieu ve cac duc van hanh thai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (thu san)) ky nang o lai. hieu ve cac duc van hanh thai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu san)) ky nang o lai. hieu ve cac duc van hanh thai ((cua tre) OR (cua triet))*.